All works well, until I've upgrade from 4.2.0 to RC7
Upgrade process was complete successfully, but require me to upgrade roundcube library.
After do it, here is my library:

and if I try to go on my mailbox:
Not Found
The requested URL /public_html/modules/OSSMail/roundcube/ was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I had the same problem can be downloaded by modifying this parameter.
https://github.com/YetiForceCompany/YetiForceCRM/blob/b7d221e40c4b0608bbd72a4cae2592f39dbc3d0e/config/developer.php#L20
Thank you so much now works well.
Most helpful comment
I had the same problem can be downloaded by modifying this parameter.
https://github.com/YetiForceCompany/YetiForceCRM/blob/b7d221e40c4b0608bbd72a4cae2592f39dbc3d0e/config/developer.php#L20